Hi Ken,
Here are 2 pictures of the switch. I made an error in my prior post about being secured with speed nuts.
In these pictures you can see the screw is secured by the switch body wings (one screw fell under the car when I removed the switch so only one is pictured).
When mounted under the dash, the switch rocker moves with no binding. The connector on the back can only go on one way being it is keyed.
Let me know if you need any more information.
Good Luck!
Mike